THE ALLENDE – PIEDRAS NEGRAS TRANSBOUNDARY AQUIFER: AN INITIAL MODELING ASSESSMENT A Thesis by LAURA MARCELA RODRIGUEZ LOZADA Submitted to the Office of Graduate and Professional Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Chair of Committee, Hongbin Zhan Co-Chair of Committee, Rosario Sanchez Committee Member, Peter Knappett Head of Department, John R. Giardino December 2018 Major Subject: Water Management and Hydrological Science Copyright 2018 Laura Marcela Rodriguez Lozada